Meh it's probably more of a style thing but with 77-99 against unknowns you'll be seeing overcards often and will probably have to c/f quite a few flops or c/c flop and maybe fold turn if he doesn't second barrel often.

Bluffing with them also sucks since you have 2 outs if called and you fold out air that your ahead of. I'd rather flat 98s,9Ts,JTs in the SB vs a EP/MP raise since they can continue on so many more flops.

Anyway it doesn't work for me (atm) but your post flop skills are likely better so you can play more profitably with these hands.